1704942853
I don’t know what to do about it．我不知道该把它怎么办。
1704942854
1704942855
She did not know who to ask advice from．她不知道该向谁请教。
1704942856
1704942857
有时可跟复合结构（不定式可带to，也可不带to，但在被动结构中需加to）：
1704942858
1704942859
I have never known her to tell lies．我从未听说她撒过谎。
1704942860
1704942861
Have you ever known her lose her temper？你曾听说她发过脾气吗？
1704942862
1704942863
No serious injuries were known to have occurred．未听说有人受重伤。
1704942864
1704942865
He was known to be a dangerous criminal．大家知道他是一个危险的囚犯。
1704942866
1704942867
I know this to be a fact．我知道这是事实。（不定式为be时to不能省略。）
1704942868
1704942869
这种结构比较文气，在口语中用从句更自然一些：
1704942870
1704942871
I know this is a fact．
1704942872
1704942873
It’s known no serious injuries have occurred.
1704942874
1704942875
We knew that he was a dangerous criminal.
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1704942877
know后面也可以不跟宾语：
1704942878
1704942879
“His father came here yesterday.” “Yes, I know.”
1704942880
1704942881
“他的父亲昨天来了。”“是的，我知道。”
1704942882
1704942883
“The stuffs very good.” “I know.” “这东西很好。”“我知道。”
1704942884
1704942885
同样意思美国人有时用I know it表示：
1704942886
1704942887
“This town is dying!” “I know it.” “这座城市正在死亡。”“我知道。”
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1704942889
它还可构成几个短语，在日常生活中很有用：
1704942890
1704942891
know about 了解，知道（某事）：
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1704942893
I happen to know about him．我恰好了解他的情况。
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1704942895
I knew about (of) it long ago．我早就知道这件事了。
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1704942897
I feel that I knew about the value of my own work．我感觉我了解我自己工作的价值。
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1704942899
know of 听说过，知道（有……）：
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1704942901
“Do you know Mr. Morrison?” “No, but I knew of him.”
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